false
midorz
The variable of distance is eliminated when discussing absolute brightness. Absolute brightness specifically refers to the inherent brightness of an astronomical object without the influence of its distance from the observer.
Generally speaking, the apparent luminosity would be an inverse square relationship, which is to say, if the same star was at twice the distance, a quarter of the light would be reaching the observer. But absolute luminosity can of course vary without regard to distance from Earth - dim stars can be close, or bright stars distant, or vice-versa.
One dimmer star can be closer than a brighter star that is far away. Light flux decreases as the square of the distance. A star that is three times as far away will have to shine nine times brighter than the closer star (absolute magnitude) to appear to have the same magnitude (apparent magnitude). Because apparent magnitude is the brightness of a star, as seen from Earth, whereas absolute magnitude is the brightness of a star as seen from the same distance - about 32.6 light years away.
For the same real brightness, at a larger distance it would look less bright. On the other hand, you may have two stars that look like they are the same brightness, but one might be million times brighter (in real brightness) than the other - which would be compensated by the fact that the brighter star is a thousand times farther away.
midorz
No. The stars are not only not the same brightness, they are not the same distance from us - they just "appear" to be as part of the optical illusion of earthbound astronomy. They are all of varying brightness, though fairly close in brightness overall.
No. Brighter distant stars can have the same apparent magnitude as fainter stars that are closer.(Absolute magnitude does not refer to actual brightness, but rather to what the brightness of a star would likely be at an arbitrary distance of 10 parsecs, rather than its actual distance.)
No, a star's absolute magnitude is a measure of its intrinsic brightness regardless of its distance from the observer. It is a standardized measure that allows for comparison of the brightness of stars at a set distance.
No. Stars vary greatly in size and brightness.
The size of stars depends on their mass and the stage of their life cycle. Constellations are just stars which happen to lie in the same general direction from Earth, and have nothing really to do with each other. Apparent brightess of a star or galaxy is the result of its intrinsic brightness and its distance from us.
If two stars have the same size and brightness, but one is further away, it will appear dimmer. The brightness of a star is inversely proportionate to the square of its distance. In other words, a star ten light years away will be four times dimmer than one just as bright (absolute magnitude) that is only five light years away. Larger stars also tend to be brighter, though most of the really big stars are red giants.
Stars in the night sky maintain the same distance from Earth. Despite their different distances from us, the stars appear to be at a fixed distance from each other when observed from our perspective on Earth.
The variable of distance is eliminated when discussing absolute brightness. Absolute brightness specifically refers to the inherent brightness of an astronomical object without the influence of its distance from the observer.
Absolute magnitude
Generally speaking, the apparent luminosity would be an inverse square relationship, which is to say, if the same star was at twice the distance, a quarter of the light would be reaching the observer. But absolute luminosity can of course vary without regard to distance from Earth - dim stars can be close, or bright stars distant, or vice-versa.
The four main moons all look about the same brightness as seen from Earth, and they are all at about the same distance from the Earth. That means that their brightness seen from Jupiter would depend on their distances from Jupiter.